4 x 15 reps

The video likely performed well due to its clear, concise demonstration of a common workout routine, appealing to users looking for fitness inspiration and guidance. The use of on-screen text for reps and sets, combined with visual cues, makes it easily digestible and actionable for viewers.

This video demonstrates a chest workout routine performed by two men in a gym. The workout consists of four exercises, each performed for 4 sets of 15 repetitions, with visual aids showing the correct form and muscle engagement.